* elf64-ppc.c: Use %T to print symbols names and remove redundant
	"relocation" in error messages throughout file.
	(ppc64_elf_relocate_section): Remove sibling call error message,
	replace with "call lacks nop".  Specially report errors for
	branches to function entry points via OPD lookup and branches
	to stubs.  Remove NULL symbol handling now done by %T.